CN112102775B - Display device and brightness compensation method thereof - Google Patents
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Abstract
本申请实施例提供了一种显示装置及其亮度补偿方法，涉及显示技术领域，可以解决因自发光材料劣化，而影响显示装置的显示效果的问题。本申请实施例提供一种显示装置的亮度补偿方法，所述显示装置包括多个子像素，包括：获取每一所述子像素在前一时间段的实际亮度值和发光时长；根据所述实际亮度值、所述发光时长、以及衰减参考值，确定所述子像素的电流补偿值；根据所述子像素的电流补偿值对该子像素的当前预设发光电流进行补偿，得到该子像素的亮度补偿数据。
Embodiments of the present application provide a display device and a brightness compensation method thereof, which relate to the field of display technology and can solve the problem that the display effect of the display device is affected by the deterioration of self-luminous materials. An embodiment of the present application provides a brightness compensation method for a display device. The display device includes a plurality of sub-pixels, including: acquiring the actual brightness value and lighting duration of each of the sub-pixels in a previous time period; value, the light-emitting duration, and the attenuation reference value to determine the current compensation value of the sub-pixel; according to the current compensation value of the sub-pixel, the current preset light-emitting current of the sub-pixel is compensated to obtain the brightness of the sub-pixel Compensation data.
Description
Technical Field
The present disclosure relates to display technologies, and particularly to a display device and a brightness compensation method thereof.
Background
With the advent of the mobile internet era, the wide application of mobile smart phones has become a big trend in the mobile phone market. The development of the mobile smart phone changes the life style of a plurality of people and the requirements on a communication tool, people no longer meet the use of the appearance and basic functions of the mobile phone, and pursue the mobile phone to bring more, stronger and more personalized functional services to people. Mobile smartphones have also become almost an indispensable representative configuration for this era. Nowadays, more and more consumers locate the phone purchasing target on the application functions of entertainment, business, news and service, etc. of the mobile phone, and the extreme experience of the consumer on the functions can be better met, so that the mobile phone manufacturer's target is also achieved.
With the requirement of people on Display screens, compared with a conventional Liquid Crystal Display (LCD) and an organic light-Emitting Diode (OLED) Display, the organic light-Emitting Diode Display has the advantages of high contrast, flexibility and the like, and the usage ratio of the organic light-Emitting Diode Display in mobile smart phones is higher and higher. However, the OLED has problems that it is difficult to overcome, for example, since the OLED display is a self-luminous display device, a self-luminous material has a problem of irreversible deterioration after being lit up for a long time; meanwhile, after each part of the screen is lighted for a long time, the lighting degrees of different areas are different (such as the signal display area and the central area of the screen), so that the self-luminous material in the area with a long lighting time is more seriously degraded, and the degradation of the self-luminous material affects the display effect of the OLED display.
Disclosure of Invention
An object of the present application includes, for example, providing a display device and a luminance compensation method thereof, which can solve a problem that a display effect of the display device is affected due to deterioration of a self-luminous material.
In a first aspect, a method for compensating brightness of a display device, the display device including a plurality of sub-pixels, includes: acquiring the actual brightness value and the light emitting duration of each sub-pixel in the previous time period; determining a current compensation value of the sub-pixel according to the actual brightness value, the light-emitting duration and the attenuation reference value; and compensating the current preset luminous current of the sub-pixel according to the current compensation value of the sub-pixel to obtain the brightness compensation data of the sub-pixel.
In a second aspect, a display device is provided, comprising a plurality of sub-pixels and an external circuit for controlling the display of the sub-pixels, the external circuit comprising a display signal timing module and a display signal processing module. And the display signal timing module is used for acquiring the actual brightness value and the light emitting duration of each sub-pixel in the previous time period. And the display signal processing module is used for determining the current compensation value of the sub-pixel according to the actual brightness value, the light-emitting time length and the attenuation reference value. And the display signal processing module is also used for compensating the current preset luminous current of the sub-pixel according to the current compensation value of the sub-pixel to obtain the brightness compensation data of the sub-pixel.
In the display device and the brightness compensation method thereof provided by the embodiment of the application, the attenuation degree of the luminance of the sub-pixel in the previous time period is obtained according to the actual luminance value and the luminance duration of the sub-pixel in the previous time period and the attenuation reference value, and after the luminance of the sub-pixel in the previous time period is attenuated, the current compensation value of the sub-pixel is determined according to the current luminance efficiency, and then the luminance compensation data of the sub-pixel is determined, so as to perform brightness compensation on the sub-pixel with the luminance attenuation, thereby solving the problem of luminance attenuation caused by the deterioration of the self-luminous material of the light-emitting function layer. Meanwhile, when the display device displays a picture, the light-emitting time and the light-emitting brightness of different sub-pixels are different, and the longer the light-emitting time is, the more serious the self-luminous material is degraded; the larger the light emission luminance is, the more the deterioration of the self-luminous material is, resulting in a problem that after a certain period of use, the deterioration degree of the self-luminous material in different sub-pixels is different, and the luminance is not uniform when a plurality of sub-pixels display the same screen. According to the embodiment of the application, the brightness compensation data during current display can be obtained through calculation according to the actual brightness value and the light emitting duration of the sub-pixel in the previous time period and the attenuation reference value, and the compensated data signal is input into the pixel driving circuit through the data line so as to perform brightness compensation on the sub-pixel where the self-luminous materials with different degradation degrees are located independently, so that the problem of non-uniform display brightness is solved, and the display effect of the display device is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;
fig. 3 is a circuit diagram of a pixel driving circuit and a light emitting device according to an embodiment of the present disclosure;
fig. 4 is a flowchart illustrating luminance compensation of a display device according to an embodiment of the present disclosure;
fig. 5 is a schematic top view illustrating a display device according to an embodiment of the present disclosure;
FIG. 6 is a graph showing the relationship between the current flowing through the light emitting device and the luminance of the light emitting device according to the embodiment of the present application;
fig. 7 is a flowchart illustrating luminance compensation of a display device according to an embodiment of the present disclosure;
fig. 8 is a flowchart illustrating luminance compensation of a display device according to an embodiment of the present disclosure;
Fig. 9 is a graph showing a relationship between a usage time and a luminous flux maintenance ratio of a light-emitting device according to an embodiment of the present application;
fig. 10 is a flowchart illustrating luminance compensation of a display device according to an embodiment of the present disclosure;
FIG. 11a is a graph of threshold voltage versus time for an embodiment of the present application;
FIG. 11b is a graph of threshold voltage versus current flowing through a light emitting device according to an embodiment of the present disclosure;
fig. 12 is a diagram illustrating an operating state of a driving transistor according to an embodiment of the present disclosure;
fig. 13 is a flowchart illustrating luminance compensation of a display device according to an embodiment of the present disclosure;
fig. 14 is a circuit diagram of a pixel driving circuit and a light emitting device according to an embodiment of the present disclosure;
fig. 15 is a connection relationship diagram of each module of the external circuit according to the embodiment of the present application.
Reference numerals:
100-a display device; 1-a frame; 2-cover plate; 3-a display panel; 30-subpixels; 31-an array substrate; 311-a substrate; 3121-a switching transistor; 3122-a drive transistor; 313-a light emitting device; 3131 — a first electrode; 3132-a light-emitting functional layer; 3133 — a second electrode; 32-an encapsulation layer; 4-an external circuit; 41-display signal timing module; 42-display signal processing module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
The embodiment of the present invention provides a display device, where the display device includes a mobile phone, a tablet computer, a Personal Digital Assistant (PDA), a vehicle-mounted computer, and the like, and the specific application of the display device is not particularly limited in the embodiment of the present invention.
The display device may be a self-luminous display device, and the self-luminous display device may be an OLED display device or a Quantum Dot Light Emitting diode (QLED) display device.
As shown in fig. 1, taking a display device 100 as a self-light emitting display device of top emission as an example, the self-light emitting display device includes a frame 1, a cover plate 2, a display panel 3, an external circuit 4, and other electronic accessories including a camera and the like. Display panel 3 and external circuit 4 set up in frame 1, and apron 2 is located display panel 3's light-emitting side, and external circuit 4 sets up and deviates from apron 2 one side in display panel 3.
As shown in fig. 1, the display panel 3 includes an array substrate 31 and an encapsulation layer 32, and the encapsulation layer 32 is used for encapsulating the light emitting device on the array substrate 31. As shown in fig. 2, the array substrate 31 includes a substrate 311, a pixel driving circuit and a light emitting device 313 disposed on the substrate 311. The light emitting device 313 includes a first electrode 3131, a light emitting functional layer 3132, and a second electrode 3133 stacked on the substrate 311. The first electrode 3131 is an anode, and the second electrode 3133 is a cathode; alternatively, the first electrode 3131 is a cathode and the second electrode 3133 is an anode. As shown in fig. 3, the pixel driving circuit includes at least a switching transistor 3121, a driving transistor 3122, and a storage capacitor C. As shown in fig. 2 and 3, the drain of the driving transistor 3122 is electrically connected to the anode of the light emitting device 313.
For an OLED display device, the material of the light emitting functional layer 3132 is an organic light emitting material; for a QLED display device, the material of the light emitting functional layer 3132 is a quantum dot light emitting material. The organic light emitting material and the quantum dot light emitting material are self-light emitting materials, and the self-light emitting materials cause irreversible degradation problems when used for a long time and exposed to water vapor and oxygen, so that the display effect of the OLED display device or the QLED display device, namely, the display brightness of the OLED display device or the QLED display device is affected.
The inventors have studied and proposed the following solutions to solve the problem that the display effect of the display device 100 is affected by the deterioration of the self-light emitting material.
As shown in fig. 4, an embodiment of the present application provides a method for compensating luminance of a display device 100, where the display device 100 includes a plurality of sub-pixels, and the method can be implemented by:
and S11, acquiring the actual brightness value and the light emitting time length of each sub-pixel in the previous time period.
In some embodiments, as shown in fig. 5, the display device 100 includes a plurality of sub-pixels 30, and the sub-pixels 30 include the light emitting devices 313 described above.
The light emitted by the plurality of sub-pixels 30 may constitute three primary colors, for example, the plurality of sub-pixels 30 includes a blue sub-pixel, a green sub-pixel, a red sub-pixel; alternatively, the plurality of sub-pixels 30 includes a blue sub-pixel, a green sub-pixel, a red sub-pixel, and a white sub-pixel; alternatively, the plurality of sub-pixels 30 include a yellow sub-pixel, a magenta sub-pixel, and a cyan sub-pixel; alternatively, the plurality of sub-pixels 30 include a yellow sub-pixel, a magenta sub-pixel, a cyan sub-pixel, and a white sub-pixel.
Taking the example where the plurality of sub-pixels 30 includes a blue sub-pixel, a green sub-pixel, and a red sub-pixel, the light emitting device 313 in the blue sub-pixel may emit blue light, the light emitting device 313 in the green sub-pixel may emit green light, and the light emitting device 313 in the red sub-pixel may emit red light.
In some embodiments, the self-luminous material of the light emitting functional layer 3132 may be deteriorated as long as the light emitting device 313 emits light during the previous period, thereby causing the display luminance of the display apparatus 100 to be degraded.
In some embodiments, since the display brightness and the light emitting time of each sub-pixel 30 are different when the screen is displayed, the present application needs to obtain the actual brightness values and the light emitting times of all the sub-pixels 30 in the previous time period.
In some embodiments, the specific duration of the previous time period may be set according to practical situations, and this application is not limited specifically.
For example, the previous time period may be the previous hour.
And S12, determining the current compensation value of the sub-pixel 30 according to the actual brightness value, the light-emitting time length and the attenuation reference value.
In some embodiments, since the display device 100 emits light during the previous period, which causes the display luminance to decay, the degree of the luminance decay of the display device 100 during the previous period can be calculated according to the actual luminance value and the emitting time of the previous period, and the decay reference value, and the current light emitting efficiency of the display device 100 after the luminance decay of the previous period elapses, so that the current compensation value of the sub-pixel 30 is determined according to the current light emitting efficiency.
In some embodiments, one skilled in the art will appreciate that increasing the light emitting current on the light emitting device 313 may increase the light emitting brightness of the light emitting device 313.
S13, compensating the current predetermined light emitting current of the sub-pixel 30 according to the current compensation value of the sub-pixel 30, and obtaining the luminance compensation data of the sub-pixel 30. Here, when the current predetermined light emitting current is not compensated, the current that should originally flow through the light emitting device 313.
As shown in fig. 3, the pixel driving circuit may be 2T1C, 4T1C, 8T2C, etc., which is not particularly limited in this application. Taking the pixel driving circuit of 2T1C as an example, the gate of the switching transistor 3121 is electrically connected to the gate line, the first electrode is electrically connected to the data line, and the second electrode is electrically connected to the storage capacitor C and the gate of the driving transistor 3122. The working principle of the pixel driving circuit is as follows:
in the data writing phase, the switching transistor 3121 is turned on, and the driving transistor 3122 is turned off. The gate line inputs a scan signal Vgate to the switching transistor 3121, controls the switching transistor 3121 to be turned on, and the data line inputs a data signal Vdata to a first electrode of the switching transistor 3121 and stores the data signal Vdata in the storage capacitor C through a second electrode.
In the light emitting period, the switching transistor 3121 is turned off, and the driving transistor 3122 is turned on. The data signal Vdata stored in the storage capacitor C controls the driving transistor 3122 to be turned on, the first voltage terminal VDD inputs a VDD signal to the first electrode of the driving transistor 3122, so that a path is formed between the first voltage terminal VDD, the light emitting device 313, and the second voltage terminal VSS electrically connected to the cathode of the light emitting device 313, and the light emitting device 313 emits light, so that the display apparatus 100 displays a picture.
In some embodiments, after obtaining the luminance compensation data of the sub-pixel 30, the luminance compensation data may be input to the first pole of the switching transistor 3121 through the data line.
The embodiment of the present application increases Vgs (i.e., Vdata-VDD) by increasing the data signal Vdata inputted to the data line, i.e., increasing the voltage Vg inputted to the gate of the driving transistor 3122, according to the current formula
Under the condition that the channel length L, the channel width W, the capacitance Cox, the first voltage terminal VDD, and the like are not changed, the data signal Vdata is increased to increase the light emitting current Ioled of the light emitting device 313, as shown in fig. 6, the light emitting current Ioled on the light emitting device 313 is increased, and the light emitting brightness of the light emitting device 313 is increased compared with the brightness during attenuation, that is, the compensated light emitting brightness may be substantially the same as the light emitting brightness before attenuation.
Therefore, the present application can calculate the data signal Vdata corresponding to the compensated current value, i.e. the luminance compensation data of the sub-pixel 30, under the condition that the current preset light-emitting current of the sub-pixel 30 and the current compensation value of the sub-pixel 30 are known.
Here, since the data line is electrically connected to the first electrode of the column switching transistor 3121, the gate line scans the plurality of sub-pixels 30 row by row during the display of the display device 100, and thus, it is possible to individually compensate for one row of sub-pixels 30 using the data line during the scanning of each row of sub-pixels 30.
In some embodiments, the switching transistor 3121 and the driving transistor 3122 may be thin film transistors. The first pole of the thin film transistor is a source electrode, and the second pole of the thin film transistor is a drain electrode; or, the first electrode of the thin film transistor is a drain electrode, and the second electrode of the thin film transistor is a source electrode.
The embodiment of the present application provides a brightness compensation method of a display device 100, which obtains a degree of attenuation of the luminance of the sub-pixel 30 in the previous period according to the actual luminance value and the luminance duration of the sub-pixel 30 in the previous period, and after the luminance of the sub-pixel 30 in the previous period is attenuated, the current compensation value of the sub-pixel 30 is determined according to the current luminance efficiency by the current luminance efficiency of the sub-pixel 30, and then the luminance compensation data of the sub-pixel 30 is determined, so as to perform the luminance compensation data on the sub-pixel 30 with the luminance attenuation, and perform the luminance compensation on the sub-pixel with the luminance attenuation, thereby solving the problem of luminance attenuation caused by the deterioration of the self-luminous material of the light-emitting functional layer 3132. Meanwhile, since the display device 100 displays a picture with different emission times and emission luminances of different sub-pixels 30, the longer the emission time is, the more serious the self-luminous material is deteriorated; the larger the light emission luminance is, the more the deterioration of the self-luminous material is, resulting in a problem that after a certain period of use, the deterioration degree of the self-luminous material in different sub-pixels 30 is different, and the luminance is not uniform when a plurality of sub-pixels 30 display the same screen. In the embodiment of the present application, the luminance compensation data during the current display can be obtained by calculation according to the actual luminance value and the light emitting duration of the sub-pixel 30 in the previous time period and the attenuation reference value, and then the compensated data signal is input to the pixel driving circuit through the data line, so as to perform the luminance compensation on the sub-pixel 30 where the self-luminous materials with different degradation degrees are located, thereby solving the problem of non-uniform display luminance and improving the display effect of the display device 100.
As shown in fig. 7, the embodiment of the present application further provides a luminance compensation method for a display device 100, wherein the attenuation reference value includes the maximum luminance of the sub-pixel 30, the attenuation degree mapping relation, the initial luminance efficiency of the sub-pixel 30, the initial attenuation degree of the sub-pixel 30, the initial luminance of the sub-pixel 30, and the current preset luminance of the sub-pixel 30; the brightness compensation can be achieved by:
s11, acquiring the actual brightness value and the light emitting duration of each sub-pixel 30 in the previous time period.
S121, determining the attenuation degree of the luminous brightness of the sub-pixel 30 according to the actual brightness value, the luminous duration, the maximum luminous brightness of the sub-pixel 30 and the attenuation degree mapping relation.
In some embodiments, the calculation relationship of the attenuation degree of the light-emitting luminance of the current sub-pixel 30, that is, the attenuation degree mapping relationship, may be designed in advance according to the maximum light-emitting luminance of the sub-pixel 30, and the actual luminance value and the light-emitting duration of the previous period. When a new time period is entered, the attenuation degree of the current light-emitting brightness of the sub-pixel 30 can be calculated according to the attenuation degree mapping relationship, the maximum light-emitting brightness of the sub-pixel 30, and the actual brightness value and the light-emitting duration of the previous time period.
In some embodiments, the present application does not limit the attenuation degree mapping relationship, as long as the attenuation degree of the current light-emitting brightness of the sub-pixel 30 can be calculated according to the attenuation degree mapping relationship, the maximum light-emitting brightness of the sub-pixel 30, and the actual brightness value and the light-emitting duration of the previous time period.
And S122, determining a current compensation value of the sub-pixel 30 according to the attenuation degree, the initial luminous efficiency of the sub-pixel 30, the initial luminous brightness of the sub-pixel 30, the maximum luminous brightness of the sub-pixel 30 and the current preset luminous brightness of the sub-pixel 30.
In some embodiments, the specific calculation process for determining the current compensation value of the sub-pixel 30 is not limited as long as the current compensation value of the sub-pixel 30 can be determined according to the attenuation degree, the initial light emitting efficiency of the sub-pixel 30, the initial light emitting luminance of the sub-pixel 30, the maximum light emitting luminance of the sub-pixel 30, and the current preset light emitting luminance of the sub-pixel 30.
S13, compensating the current predetermined light emitting current of the sub-pixel 30 according to the current compensation value of the sub-pixel 30, and obtaining the luminance compensation data of the sub-pixel 30.
Step S11 and step S13 in the present embodiment are the same as the explanation of step S11 and step S13 in the previous embodiment, and are not repeated here.
The embodiment of the present application provides a brightness compensation method for a display device 100, which obtains the attenuation degree of the luminance brightness of the sub-pixel 30 in the previous time period according to the attenuation degree mapping relationship, the maximum luminance brightness of the sub-pixel 30, and the actual luminance value and the luminance duration in the previous time period; determining a current compensation value of the sub-pixel 30 according to the attenuation degree, the initial light emitting efficiency of the sub-pixel 30, the initial light emitting brightness of the sub-pixel 30, the maximum light emitting brightness of the sub-pixel 30, and the current preset light emitting brightness of the sub-pixel 30, and further determining brightness compensation data of the sub-pixel 30 to perform brightness compensation data on the sub-pixel 30 with the brightness attenuation, so as to perform brightness compensation on the sub-pixel 30 with the brightness attenuation, thereby solving the problem of brightness attenuation caused by the degradation of the self-luminous material of the light emitting function layer 3132, and meanwhile, as the light emitting time and the light emitting brightness of different sub-pixels 30 are different when the display device 100 displays a picture, the longer the light emitting time, the more the degradation of the self-luminous material is serious; the larger the light emission luminance is, the more the deterioration of the self-luminous material is, resulting in a problem that after a certain period of use, the deterioration degree of the self-luminous material in different sub-pixels 30 is different, and the luminance is not uniform when a plurality of sub-pixels 30 display the same screen. In the embodiment of the present application, the luminance compensation data during the current display can be obtained by calculation according to the actual luminance value and the light emitting duration of the sub-pixel 30 in the previous time period and the attenuation reference value, and then the compensated data signal is input to the pixel driving circuit through the data line, so as to perform the luminance compensation on the sub-pixel 30 where the self-luminous materials with different degradation degrees are located, thereby solving the problem of non-uniform display luminance and improving the display effect of the display device 100.
As shown in fig. 8, an embodiment of the present application further provides a method for compensating luminance of a display device 100, which can be implemented by the following steps:
s11, acquiring the actual brightness value and the light emitting duration of each sub-pixel 30 in the previous time period.
Step S11 of the present embodiment is the same as the explanation of step S11 of the previous embodiment, and is not repeated here.
And S1211, converting the light-emitting time length into a calculated time length T2 of the sub-pixel 30 emitting light with the maximum light-emitting brightness L2 in the previous time period according to the actual brightness value L1, the light-emitting time length T1 and the maximum light-emitting brightness L2 of the sub-pixel 30.
Specifically, the calculated time period T2 may be based on a formula
And (4) calculating. The actual luminance value L1 and the light-emitting duration T1 can be obtained in step S11, and the maximum light-emitting luminance L2 of the sub-pixel 30 can be obtained by testing in advance.
Here, when the display device 100 displays a frame, the luminance of the sub-pixels 30 may be different (lateral contrast); in the display device 100, the luminance of the same sub-pixel 30 may be different (vertical contrast) in different frames, the luminance of the sub-pixel 30 is different, and the intensity of the light emitting current on the light emitting device 313 is different. While the degree of attenuation of the self-luminous material is directly related to the intensity of the light emission current on the light emitting device 313, when the intensity of the light emission current on the light emitting device 313 is different, the degree of attenuation of the self-luminous material is also different.
Based on this, for convenience of calculation, the present application may convert the actual light-emitting brightness of any sub-pixel 30 in the previous period into the calculation time length of emitting light with the maximum light-emitting brightness, so as to simplify the process of subsequently calculating the attenuation degree of the light-emitting brightness.
And S1212, determining the attenuation degree X of the luminous brightness of the sub-pixel 30 according to the calculation time length T2 and the attenuation degree mapping relation.
Specifically, as shown in fig. 9, taking the light emitting device 313 as an OLED device as an example, the attenuation degree X of the light emitting luminance of the sub-pixel 30 can be divided into two stages according to the change of the usage time.
In the first stage, the service time of the OLED device is 0-1000 hours, the deterioration speed of the self-luminous material is high, and the decay speed of the luminous brightness of the sub-pixel 30 is high. The degree X of attenuation of the light emission luminance of the sub-pixel 30 is K1 × T2, where K1 is a constant.
In the second stage, the service time of the OLED device is more than 1000 hours, the degradation speed of the self-luminous material in this stage substantially satisfies linearity, and compared with the first stage, the degradation speed of the self-luminous material in the second stage is slower, and the decay speed of the luminance of the sub-pixel 30 is also slower. The degree X of attenuation of the light emission luminance of the sub-pixel 30 is K2 × T2+ a, where K2 and a are constants.
S1221, determining the current luminous efficiency η' of the sub-pixel 30 according to the attenuation degree X and the initial luminous efficiency η of the sub-pixel 30.
Specifically, the current luminous efficiency η' may be calculated according to the formula η ═ η × X. Here, the initial light emission efficiency η is a value measured when the light emitting device 313 emits light for the first time.
S1222, determining the current compensation value Δ I of the sub-pixel 30 according to the current luminous efficiency η ', the current preset luminous brightness L' of the sub-pixel 30, the initial luminous efficiency η of the sub-pixel 30 and the initial luminous brightness L of the sub-pixel 30.
Specifically, the current compensation value Δ I may be according to the formula
And (4) calculating. After the current preset luminance L' is compensated for the current preset light emitting current, the current luminance of the sub-pixel 30, which is the ideal luminance of the current display picture, can be predicted; the initial light emission luminance L is a luminance value measured when the light emitting device 313 emits light for the first time.
S13, compensating the current predetermined light emitting current I of the sub-pixel 30 according to the current compensation value Δ I of the sub-pixel 30, and obtaining the luminance compensation data Vt of the sub-pixel 30.
Specifically, the brightness compensation data Vt can be obtained according to the formula
And (4) calculating. When the current preset light emitting current I is not compensated, the current which should originally flow through the light emitting device 313 can be predicted; the first voltage end VDD is unchanged; the data signal actually input to the first electrode of the switching transistor 3121 through the data line is Vdata + Vt.
The embodiment of the present application provides a brightness compensation method for a display device 100, which may firstly convert a light-emitting duration into a calculated duration T2 for the sub-pixel 30 to emit light with a maximum light-emitting brightness L2 in a previous time period according to an actual brightness value L1, the light-emitting duration T1, and a maximum light-emitting brightness L2 of the sub-pixel 30; and determining the attenuation degree X of the light-emitting brightness of the sub-pixel 30 according to the calculation time length T2 and the attenuation degree mapping relation. Determining the current luminous efficiency eta' of the sub-pixel 30 according to the attenuation degree X and the initial luminous efficiency eta of the sub-pixel 30; then, the current compensation value Δ I of the sub-pixel 30 is determined according to the current light-emitting efficiency η ', the current preset light-emitting luminance L' of the sub-pixel 30, the initial light-emitting efficiency η of the sub-pixel 30, and the initial light-emitting luminance L of the sub-pixel 30. Finally, determining the brightness compensation data of the sub-pixel 30 according to the current compensation value Δ I and the current preset light emitting current I to perform brightness compensation on the sub-pixel 30 with brightness attenuation, so as to solve the problem of brightness attenuation caused by the degradation of the self-luminous material of the light emitting functional layer 3132, and meanwhile, as the display device 100 displays a picture, the longer the light emitting time is, the more the self-luminous material is degraded; the larger the light emission luminance is, the more the deterioration of the self-luminous material is, resulting in a problem that after a certain period of use, the deterioration degree of the self-luminous material in different sub-pixels 30 is different, and the luminance is not uniform when a plurality of sub-pixels 30 display the same screen. The embodiment of the present application can calculate the luminance compensation data of the current display according to the actual luminance value and the light emitting duration of the sub-pixel 30 in the previous time period, and then input the compensated data signal to the pixel driving circuit through the data line, so as to perform the luminance compensation on the sub-pixel 30 where the self-luminous materials with different degradation degrees are located, thereby solving the problem of non-uniform display luminance and improving the display effect of the display device 100.
As shown in fig. 10, an embodiment of the present application further provides a method for compensating luminance of a display device 100, which can be implemented by the following steps:
s11, acquiring the actual brightness value and the light emitting duration of each sub-pixel 30 in the previous time period.
Step S11 of the present embodiment is the same as the explanation of step S11 of the previous embodiment, and is not repeated here.
And S21, determining the threshold voltage compensation value of the sub-pixel 30 according to the actual brightness value, the light-emitting time length and the threshold voltage reference value.
In some embodiments, as shown in fig. 11a, the light emitting device 313 has a problem in that the threshold voltage Vth is shifted after a long time use. As shown in fig. 11b, in the case where the threshold voltage Vth is increased with the use time, the voltage across the light emitting device 313 needs to be increased in order to keep the current flowing across the light emitting device 313 constant.
S22, the second voltage terminal VSS 'of the pixel driving circuit corresponding to the sub-pixel 30 is compensated according to the threshold voltage compensation value Vth' of the sub-pixel 30.
Specifically, in a light emitting period in which the driving transistor 3122 is turned on, a path is formed between the first voltage terminal VDD, the light emitting device 313, and the second voltage terminal VSS electrically connected to the cathode of the light emitting device 313, and in the absence of the threshold voltage Vth, VDD — VSS is Vsd + Voled. Where Vsd represents a voltage difference between the first and second poles of the driving transistor 3122.
As the use time increases, the light emitting device 313 has a problem that the threshold voltage Vth shifts, and at this time, VDD-VSS is Vsd + Voled + Vth. In the case where both the first voltage terminal VDD and the second voltage terminal VSS are kept constant, the voltage across the light emitting device 313 is affected, thereby affecting the light emitting luminance of the light emitting device 313.
Based on this, the embodiment of the application can compensate the second voltage terminal VSS', and offset the threshold voltage Vth of the light emitting device 313 by using the threshold voltage compensation value, so as to avoid affecting the voltage of the light emitting device 313 and further affecting the light emitting brightness of the light emitting device 313.
Specifically, the voltage value VSS ' input to the second voltage terminal after compensation is VSS-Vth ', and a path between the first voltage terminal VDD, the light emitting device 313, and the second voltage terminal VSS ' electrically connected to the cathode of the light emitting device 313 may be represented as VDD- (VSS-Vth) ═ Vsd Voled + Vth. Where Vth ═ Vth.
In some embodiments, as shown in fig. 12, during a light emitting period when the driving transistor 3122 is turned on, the driving transistor 3122 may be operated in a saturation region so that the light emitting device 313 sufficiently emits light.
Since the present application compensates the threshold voltage compensation value Vth 'for canceling the threshold voltage Vth at the second voltage terminal VSS', the operation of the driving transistor 3122 is not affected, and the driving transistor 3122 still operates in a saturation region during the compensation process, so that the light emitting device 313 sufficiently emits light.
In some embodiments, since the light emitting devices 313 correspond to the pixel driving circuits one to one, and the cathode of each light emitting device 313 is electrically connected to one second voltage terminal VSS ', it is possible to individually compensate for one sub-pixel 30 by changing the voltage input to the second voltage terminal VSS'.
In some embodiments, the second voltage terminal VSS 'and the data signal Vdata may be compensated at the same time, and when the second voltage terminal VSS' and the data signal Vdata are compensated at the same time, they do not interfere with each other. The voltage input to the second voltage terminal VSS' may be provided by a Power Management integrated circuit (Power Management IC, PMIC for short); the data signal Vdata input to the first electrode of the switching transistor 3121 may be output from a Driver IC (Driver IC), and transmitted to the first electrode of the switching transistor 3121 after passing through a digital-to-analog conversion circuit.
If the conventional display device 100 displays one screen for a long time, a screen burn-in phenomenon may occur, thereby affecting the display effect of the display device 100. The prior art approach to the burn-in problem is to detect the change in voltage at the anode under the same current flowing through the light emitting device 313 and the same voltage at the cathode, so as to compensate for the change in the voltage difference between the anode and the cathode.
However, the display effect is deteriorated due to both the threshold voltage Vth shift and the deterioration of the self-light emitting material, and the prior art only compensates for the threshold voltage Vth shift and cannot effectively compensate for the display luminance of the display device 100.
Accordingly, the present application provides a method for compensating the brightness of the display device 100, which can simultaneously compensate the second voltage terminal VSS' and the data signal Vdata, so as to simultaneously compensate the brightness problem caused by the shift of the threshold voltage Vth and the degradation of the self-luminous material, effectively compensate the display brightness of the display device 100, avoid the problem of non-uniform display brightness of the display device 100 due to the serious degradation of part of the self-luminous material and the larger influence of the threshold voltage Vth because the display time of part of the display device 100 is longer, and improve the display effect of the display device 100.
As shown in fig. 13, the present embodiment further provides a luminance compensation method for a display device 100, where the threshold voltage reference value includes a mapping relationship between the maximum luminance of the sub-pixel 30 and the threshold voltage; the brightness compensation can be achieved by:
s11, acquiring the actual brightness value and the light emitting duration of each sub-pixel 30 in the previous time period.
Step S11 of the present embodiment is the same as the explanation of step S11 of the previous embodiment, and is not repeated here.
And S211, converting the luminous time length T1 into a calculated time length T2 that the sub-pixel 30 emits light with the maximum luminous brightness L2 in the previous time period according to the actual brightness value L1, the luminous time length T1 and the maximum luminous brightness L2 of the sub-pixel 30.
Specifically, the calculated time period T2 may be based on a formula
And (4) calculating. The actual luminance value L1 and the light-emitting duration T1 can be obtained in step S11, and the maximum light-emitting luminance L2 of the sub-pixel 30 can be obtained by testing in advance.
Here, when the display device 100 displays a frame, the luminance of the sub-pixels 30 may be different (lateral contrast); in the display device 100, the luminance of the same sub-pixel 30 may be different (vertical contrast) in different frames, and the luminance of the sub-pixel 30 is different and is also affected by the threshold voltage Vth.
Based on this, for the convenience of calculation, the present application may convert the actual light-emitting brightness of any sub-pixel 30 in the previous time period into the calculation time length of emitting light with the maximum light-emitting brightness, so as to simplify the subsequent process of calculating the threshold voltage compensation value Vth'.
S212, determining a threshold voltage compensation value Vth' according to the calculated time length T2 and the threshold voltage mapping relation.
Specifically, as shown in fig. 11a, it can be seen that the threshold voltage compensation value Vth 'is in a power function relationship with the calculation time period T2, and the threshold voltage compensation value Vth' can be T2 according to the formula Vth ═ T2bAnd (4) calculating. Wherein b is a constant.
S22, the second voltage terminal VSS 'of the pixel driving circuit corresponding to the sub-pixel 30 is compensated according to the threshold voltage compensation value Vth' of the sub-pixel 30.
Step S11 and step S22 in the present embodiment are the same as the explanation of step S11 and step S22 in the previous embodiment, and are not repeated here.
The embodiment of the present application provides a brightness compensation method for a display device 100, which may convert a light-emitting duration T1 into a calculated duration T2 that the sub-pixel 30 emits light with a maximum light-emitting duration L2 in a previous time period according to an actual brightness value L1, the light-emitting duration T1, and a maximum light-emitting duration L2 of the sub-pixel 30; and then, according to the calculated time length T2 and the threshold voltage mapping relationship, determining a threshold voltage compensation value Vth 'to compensate the second voltage terminal VSS' of the pixel driving circuit corresponding to the sub-pixel 30 according to the threshold voltage compensation value Vth 'of the sub-pixel 30, so as to compensate the brightness of the display apparatus 100 by compensating the second voltage terminal VSS', and avoid the influence of the threshold voltage Vth on the light emitting device 313 on the display effect of the display apparatus 100.
As shown in fig. 14, the present embodiment further provides a method for compensating luminance of a display device 100, in which the pixel driving circuit includes a switching transistor T1, a driving transistor T2, and an auxiliary driving transistor T3, a detecting transistor T4, and a sampling switch K. The working process of the pixel driving circuit is slightly different from that of the driving transistor of 2T1C, and the specific working process is as follows:
in the data writing phase, the switching transistor T1 is turned on, the driving transistor T2 is turned off, the data signal Vdata is written to the first pole of the switching transistor T1 through the data line, and the data signal Vdata is stored in the capacitor C through the switching transistor T1.
In the light emitting stage, the switching transistor T1 is turned off, the driving transistor T2 is turned on, the auxiliary driving transistor T3 is turned on, the detecting transistor T4 is turned on, the sampling switch K is connected to the signal Ref, and the light emitting device 313 emits light normally.
In the first detection phase, the switching transistor T1 is turned off, the driving transistor T2 is turned on, the auxiliary driving transistor T3 is turned on, and the detection transistor T4 is turned on, so that the sampling switch K is in a floating (floating) state, the light emitting device 313 gradually becomes dark from normal light emission, and the potential at the anode of the light emitting device 313 gradually decreases until the voltage difference between the anode and the cathode of the light emitting device 313 decreases to the threshold voltage Vth.
In the second detection phase, the switch transistor T1 is turned off, the driving transistor T2 is turned on, the auxiliary driving transistor T3 is turned on, the detection transistor T4 is turned on, the sampling switch K is connected to the sampling signal ADC, the sampling signal ADC reads the initial potential of the anode of the light emitting device 313, the threshold voltage Vth is known, and the change amount of the threshold voltage Vth is known by comparing the initial potential with the initial potential of the anode.
Through the above processes, it can be known that the variation amount of the threshold voltage Vth, i.e., Δ Vth, in the previous period can be compensated for the luminance by the data signal Vdata according to the current formula provided in the foregoing embodiment; alternatively, the luminance compensation may be implemented by compensating the second voltage terminal VSS according to the path formed among the first voltage terminal VDD, the driving transistor T2, the auxiliary driving transistor T3, and the second voltage terminal VSS as provided in the previous embodiments.
As shown in fig. 1, the embodiment of the present application further provides a display device 100, where the display device 100 includes a plurality of sub-pixels 30 and an external circuit 4 for controlling the display of the sub-pixels 30. As shown in fig. 15, the external circuit 4 includes a display signal timing module 41 and a display signal processing module 42.
And a display signal timing module 41, configured to obtain an actual brightness value and a light emitting duration of each sub-pixel 30 in a previous time period.
And the display signal processing module 42 is configured to determine a current compensation value of the sub-pixel 30 according to the actual brightness value, the light-emitting duration, and the attenuation reference value.
Specifically, the display signal processing module 42 is configured to convert the light-emitting duration into a calculated duration T2 in which the sub-pixel 30 emits light with the maximum light-emitting luminance L2 in the previous period according to the actual luminance value L1, the light-emitting duration T1, and the maximum light-emitting luminance L2 of the sub-pixel 30.
The calculated time period T2 may be according to the formula
And (4) calculating. The actual luminance value L1 and the light-emitting duration T1 can be obtained in step S11, and the maximum light-emitting luminance L2 of the sub-pixel 30 can be obtained by testing in advance.
Then, the display signal processing module 42 is configured to determine the attenuation degree X of the light emitting brightness of the sub-pixel 30 according to the calculated time length T2 and the attenuation degree mapping relation.
As shown in fig. 9, taking the light emitting device 313 as an OLED device as an example, the degree X of attenuation of the light emitting luminance of the sub-pixel 30 can be divided into two stages according to the variation of the usage time.
In the first stage, the service time of the OLED device is 0-1000 hours, the deterioration speed of the self-luminous material is high, and the decay speed of the luminous brightness of the sub-pixel 30 is high. The degree X of attenuation of the light emission luminance of the sub-pixel 30 is K1 × T2, where K1 is a constant.
In the second stage, the service time of the OLED device is more than 1000 hours, the degradation speed of the self-luminous material in this stage substantially satisfies linearity, and compared with the first stage, the degradation speed of the self-luminous material in the second stage is slower, and the decay speed of the luminance of the sub-pixel 30 is also slower. The degree X of attenuation of the light emission luminance of the sub-pixel 30 is K2 × T2+ a, where K2 and a are constants.
Then, the display signal processing module 42 is used to determine the current luminous efficiency η' of the sub-pixel 30 according to the attenuation degree X and the initial luminous efficiency η of the sub-pixel 30.
The current luminous efficiency η' can be calculated according to the formula η ═ η × X. Here, the initial light emission efficiency η is a value measured when the light emitting device 313 emits light for the first time.
Then, the display signal processing module 42 is configured to determine the current compensation value Δ I of the sub-pixel 30 according to the current light-emitting efficiency η ', the current preset light-emitting luminance L' of the sub-pixel 30, the initial light-emitting efficiency η of the sub-pixel 30, and the initial light-emitting luminance L of the sub-pixel 30.
The current compensation value Δ I can be according to the formula
And (4) calculating. After the current preset luminance L' is compensated for the current preset light emitting current, the current luminance of the sub-pixel 30, which is the ideal luminance of the current display picture, can be predicted; the initial light emission luminance L is a luminance value measured when the light emitting device 313 emits light for the first time.
The display signal processing module 42 is further configured to compensate the current preset light emitting current of the sub-pixel 30 according to the current compensation value of the sub-pixel 30, so as to obtain the luminance compensation data of the sub-pixel 30.
The brightness compensation data Vt can be obtained according to the formula
And (4) calculating. When the current preset light emitting current I is not compensated, the current which should originally flow through the light emitting device 313 can be predicted; the first voltage end VDD is unchanged; the data signal actually input to the first electrode of the switching transistor 3121 through the data line is Vdata + Vt.
Parts of the explanation of the present application are the same as the description of the corresponding parts of the previous embodiments, and are not repeated herein.
In some embodiments, the external Circuit 4 may be a Flexible Printed Circuit (FPC) bonded (bonding) from a side of the array substrate 31 close to the encapsulation layer 32 to a side of the array substrate 31 away from the encapsulation layer 32.
In some embodiments, the external circuit 4 may include a driving IC including a display signal timing module 41 and a display signal processing module 42. The Access terminal (AP for short) sends the display signal to the external circuit 4, and after the external circuit 4 completes the corresponding image quality improvement, the display signal timing module 41 obtains the actual brightness value and the light emitting duration of each sub-pixel 30 in the previous time period, and sends the actual brightness value and the light emitting duration to the display signal processing module 42; after receiving the actual brightness value and the light-emitting time length, the display signal processing module 42 calculates to obtain the brightness compensation data according to the calculation method of the foregoing embodiment. The driving IC transmits the luminance compensation data in the form of a digital signal to the digital-to-analog conversion circuit, which converts the luminance compensation data in the form of a digital signal into luminance compensation data in the form of an analog signal, which is input to the first pole of the switching transistor 3121 through the data line.
The embodiment of the application provides a display device 100, and the display device 100 comprises a display panel 3 and an external circuit 4. The display panel 3 includes a plurality of sub-pixels 30, and the external circuit 4 includes a display signal timing block 41 and a display signal processing block 42. The display signal timing module 41 and the display signal processing module 42 can be utilized to perform brightness compensation on the plurality of sub-pixels 30 in the display panel 3. Before mass production, the display signal timing module 41 and the display signal processing module 42 are integrated in the external circuit 4, and after mass production, the display signal timing module 41 and the display signal processing module 42 can be used for luminance compensation of the plurality of sub-pixels 30 after a period of time, so that influence on user experience due to display effect problems is avoided.
Optionally, the display signal processing module 42 is further configured to determine a threshold voltage compensation value of the sub-pixel 30 according to the actual brightness value, the light-emitting duration, and the threshold voltage reference value.
Specifically, the display signal processing module 42 is configured to convert the light-emitting duration T1 into a calculated duration T2 that the sub-pixel 30 emits light with the maximum light-emitting luminance L2 in the previous time period according to the actual luminance value L1, the light-emitting duration T1, and the maximum light-emitting luminance L2 of the sub-pixel 30.
The calculated time period T2 may be according to the formula 
And (4) calculating. The actual luminance value L1 and the light-emitting duration T1 can be obtained in step S11, and the maximum light-emitting luminance L2 of the sub-pixel 30 can be obtained by testing in advance.
Then, the display signal processing module 42 is configured to determine the threshold voltage compensation value Vth' according to the calculated time length T2 and the threshold voltage mapping relation.
As shown in fig. 11a, it can be seen that the threshold voltage compensation value Vth 'is in a power function relationship with the calculation time period T2, and the threshold voltage compensation value Vth' can be T2 according to the formula Vth ═ T2bAnd (4) calculating. Wherein b is a constant.
The display signal processing module 42 is further configured to compensate the second voltage terminal VSS' of the pixel driving circuit corresponding to the sub-pixel 30 according to the threshold voltage compensation value of the sub-pixel 30.
Specifically, in a light emitting period in which the driving transistor 3122 is turned on, a path is formed between the first voltage terminal VDD, the light emitting device 313, and the second voltage terminal VSS electrically connected to the cathode of the light emitting device 313, and in the absence of the threshold voltage Vth, VDD — VSS is Vsd + Voled. Where Vsd represents a voltage difference between the first and second poles of the driving transistor 3122.
As the use time increases, the light emitting device 313 has a problem that the threshold voltage Vth shifts, and at this time, VDD-VSS is Vsd + Voled + Vth. In the case where both the first voltage terminal VDD and the second voltage terminal VSS are kept constant, the voltage across the light emitting device 313 is affected, thereby affecting the light emitting luminance of the light emitting device 313.
Based on this, the embodiment of the application can compensate the second voltage terminal VSS', and offset the threshold voltage Vth of the light emitting device 313 by using the threshold voltage compensation value, so as to avoid affecting the voltage of the light emitting device 313 and further affecting the light emitting brightness of the light emitting device 313.
Specifically, the voltage value VSS ' input to the second voltage terminal after compensation is VSS-Vth ', and a path between the first voltage terminal VDD, the light emitting device 313, and the second voltage terminal VSS ' electrically connected to the cathode of the light emitting device 313 may be represented as VDD- (VSS-Vth) ═ Vsd Voled + Vth. Where Vth ═ Vth.
Parts of the explanation of the present application are the same as the description of the corresponding parts of the previous embodiments, and are not repeated herein.
In some embodiments, the external circuit 4 may include a PMIC including a display signal timing module 41 and a display signal processing module 42. The Access terminal (AP for short) sends the display signal to the external circuit 4, and after the external circuit 4 completes the corresponding image quality improvement, the display signal timing module 41 obtains the actual brightness value and the light emitting duration of each sub-pixel 30 in the previous time period, and sends the actual brightness value and the light emitting duration to the display signal processing module 42; after receiving the actual brightness value and the light-emitting time, the display signal processing module 42 calculates a threshold voltage compensation value according to the calculation method of the foregoing embodiment. The PMIC transmits the threshold voltage compensation value in the form of a digital signal to the digital-to-analog conversion circuit, the digital-to-analog conversion circuit converts the threshold voltage compensation value in the form of a digital signal into the threshold voltage compensation value in the form of an analog signal, and the threshold voltage compensation value in the form of an analog signal is input to the voltage terminal VSS'.
In the embodiment of the present application, the display signal processing module 42 may convert the light-emitting duration T1 into a calculated duration T2 that the sub-pixel 30 emits light with the maximum light-emitting luminance L2 in the previous time period according to the actual luminance value L1, the light-emitting duration T1, and the maximum light-emitting luminance L2 of the sub-pixel 30; and then, according to the calculated time length T2 and the threshold voltage mapping relationship, determining a threshold voltage compensation value Vth 'to compensate the second voltage terminal VSS' of the pixel driving circuit corresponding to the sub-pixel 30 according to the threshold voltage compensation value Vth 'of the sub-pixel 30, so as to compensate the brightness of the display apparatus 100 by compensating the second voltage terminal VSS', and avoid the influence of the threshold voltage Vth on the light emitting device 313 on the display effect of the display apparatus 100.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
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| CN115995211A (en) * | 2021-10-19 | 2023-04-21 | 广州视源电子科技股份有限公司 | Current compensation method, processor, device and medium of OLED display device |
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